Hi David
That is what I am doing the PLL LNB is manageable without modification for
cw and ssb and most of my equipment is left on 24/7 so no warm up
problems.
I do have a high spec satellite RX with selectable digital or
analogue reception plus various outputs, IF, BASEBAND etc. also manual frequency
and parameter settings. This could be an alternative method of reception and
maybe more stable than the more common LNB/DONGLE method and avoids a T bias
module
73 de mal/g3kev
Sent: Wednesday, March 06, 2019 5:18 PM
Subject: Re: Not LF: Opera via QO-10
Hi Mal
Most of the LNBs designed for HD TV have a PLL for low phase noise. These
have 'acceptable' drift for CW and SSB QSOs......Just let them warm up for
10mins before you use them. (or fit a TCXO instead of the 27 / 25MHz
crystal)
No set top box required. Just small dish + LNB into a
dongle. Trying to get an output directly at 70cms is a bit hit and
miss as you are well below the lower 750MHz limit of the LNB.
73
David
Marku
There must be a way to modify a satellite RX to receive the AO 100. The
SAT BOX would have AFC built in to avoid LNB drift in normal use.
One method would be to set up the RX box to analogue reception and tune
across the base band, another to tap off the IF 480 Mhz and tune across the IF
with a 70cms amateur RX or SDR dongle and computer
Maybe someone has tried a similar method
73 de mal/g3kevr
Sent: Sunday, March 03, 2019 4:51 PM
Subject: Re: Not LF: Opera via QO-100
Hi
Mal, my 2.4 GHz TX is fairly improvised and may
not be easy to reproduce... I've extracted the LO from an old Sat-TV receiver,
followed by a small Minicircuit amplifier and a 60 cm dish indoors. The PLL
consists of the 1/64 prescaler output fed to a CD4030 XOR phase comparator,
along with a 18.75082 MHz Rubidium-controlled reference. There are surely much better ways to generate a decent 13 cm
signal. PA1SDB mentioned that he uses an Adalm-Pluto SDR from Analog
Devices. You might be able to pick us up on the web-sdr,
using 10489603.5 kHz USB dial, and Opera SW set to Op-05 speed by selecting
e.g. the 1296 MHz band. Yes we could try a crossband contact, but not today.
To count as a valid QSO, we'd probably also need to set up our own receivers,
both for 10.5 GHz and 472 kHz. Best 73, Markus -----Ursprüngliche Mitteilung----- Von: mal hamilton
< [email protected]> An: rsgb_lf_group
< [email protected]> Verschickt:
So, 3. Mrz 2019 16:24 Betreff: Re: Not LF: Opera via QO-100
Markus
How about a XBAND qso AO100/MF on CW
You TX via satellite to me and I tx on 472.5 Khz CW
73 de mal/g3kev
Sent: Sunday, March 03, 2019 1:44 PM
Subject: Not LF: Opera via QO-100
Listening
to the below-mentioned Goonhilly web-sdr, I noticed an interrupted carrier on
10489.605 MHz, which turned out to be 10 mW Opera-2 and Opera-05 transmissions
from PA1SDB. Peter has been well known in the LF group for running a
VLF-Grabber in Appingedam. During the last week,
I had managed to built a rudimentary but stable 2.4 GHz CW transmitter,
allowing me to add in another Opera signal on Es'hail-2. Anyone else to join
in? Best 73, Markus (DF6NM) -----Ursprüngliche Mitteilung----- Von: VIGILANT Luis Fernández < [email protected]> An: [email protected] < [email protected]> Verschickt:
So, 17. Feb. 2019 22:21 Betreff: LF: MF/LF chat over QA-100
Geostationary Satellite ?
Hi
All
May be someone has the equipment and is in the footprint of Es'Hail-2,
formely AMSAT QA-100 satellite?
Nice place for chats working as an HF band permanently open and with
outstanding sensibility
Anybody (appart from David, G0MRF) interested in joining an MF/LF/VLF
chat ?
You need just an SSB rig at 144 or 432, an upconverter to 2.4GHz and a
WiFi PA and antenna and you are in
For Rx you can even use the WebSDR at Goonhilly
Unfortunately the footprint of the
satellite do not cover America (only the extreme East of Brazil)
nor Australia (reaching up to thailand).
But sites like Reunion are in the footprint
73 de Luis
EA5DOM
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